SpiceCRM is the next level of Evolution of SugarCRM. As SugarCRM decides to let its CE version go, we decided to pick it up and continue in the spirit but even make it better. Not only are we utilizing what has been done in the past. We are further developing the core ensuring support for new technologies like PHP7 which gives huge performance gain (PHP7.1. in coming December release). Yet we are also adding missing functionality with our focus to make an Enterprise fit product. Missing features in SugarCRM like a Territorry Management, state of the Art reporting and other tools are available and complete our understanding of what an enterprise class product needs to support.
Workflow is a SugarPRO functionality, not CE. SpiceCRM also has a workflow module (beta version for now but being developed) but as in Sugar, it is not part of Community Edition.